Hi Glen, I did some tests on my local setup. I can checkpoint and restart a VNC session. Also, DMTCP complains if a binary is setuid, so it should have reported it on your setup if that were the case.
So, it looks like some other configuration issue. Is it possible for you to compile a version of VNC and try that? You can also try ruling out some AppArmor-like mechanism by renaming/moving your vncserver executable. Thanks, Rohan ----- Original Message ----- From: "Glen MacLachlan" <macl...@gwu.edu> To: "Rohan Garg" <rohg...@ccs.neu.edu> Cc: "dmtcp-forum" <dmtcp-forum@lists.sourceforge.net> Sent: Monday, April 13, 2015 7:20:25 PM Subject: Re: [Dmtcp-forum] DMTCP+VNC Hi Rohan, I checked for the setuid bit and found it is not set: [maclach@localhost ~]$ ls -l `which vncserver` -rwxr-xr-x. 1 root root 20378 Oct 30 08:46 /usr/bin/vncserver I don't know if this matters much but I installed tightvnc from yum (using CentOS 6.5) Xvnc TigerVNC 1.1.0 - built Oct 30 2014 12:46:27 Copyright (C) 1999-2011 TigerVNC Team and many others (see README.txt) See http://www.tigervnc.org for information on TigerVNC. Underlying X server release 11500000, The X.Org Foundation I also checked to see if there was some generic block preventing preloading with vncserver and that doesn't seem to be the case either. I preload a c++ library just to see if I could do it with vncserver and it appears to work: [maclach@localhost ~]$ export LD_PRELOAD=libstdc++.so.6 ;vncserver :1 New 'localhost.localdomain:1 (maclach)' desktop is localhost.localdomain:1 Starting applications specified in /home/maclach/.vnc/xstartup Log file is /home/maclach/.vnc/localhost.localdomain:1.log Can you suggest some other workarounds? Regards, Glen. On Mon, Apr 13, 2015 at 6:30 PM, Rohan Garg <rohg...@ccs.neu.edu> wrote: > Hi Glen, > > Could you please check that your vncserver executable doesn't have the > setuid > bit set? (Try: ls -l `which vncserver`) > > If the vncserver is not a setuid binary, it could be that the vncserver is > on > a list of "protected" apps in AppArmor. The kernel doesn't allow > LD_PRELOAD on > such applications. We can suggest some workarounds depending on what you > have. > > Thanks, > Rohan > > ----- Original Message ----- > From: "Glen MacLachlan" <macl...@gwu.edu> > To: "dmtcp-forum" <dmtcp-forum@lists.sourceforge.net> > Sent: Monday, April 13, 2015 5:25:30 PM > Subject: [Dmtcp-forum] DMTCP+VNC > > Hi, > > First, dmtcp is great and I'm very happy with it, generally. I've been > trying to get the recipe for using dmtcp with vnc (found here: > http://dmtcp.sourceforge.net/FAQ.html ) working and I've run into some > unanticipated trouble that I'd like to bounce off somebody more > knowledgeable than I. > > I am using 2.4.0-rc2 and tightvnc for this discussion. Following the > instructions, in a terminal I do the following: > > [maclach@localhost ~]$ dmtcp_launch vncserver :1 > dmtcp_coordinator starting... > Host: localhost.localdomain (127.0.0.1) > Port: 7779 > Checkpoint Interval: disabled (checkpoint manually instead) > Exit on last client: 1 > Backgrounding... > ERROR: ld.so: object '/disk01/apps/dmtcp/lib/dmtcp/libdmtcp_alloc.so' from > LD_PRELOAD cannot be preloaded: ignored. > ERROR: ld.so: object '/disk01/apps/dmtcp/lib/dmtcp/libdmtcp_dl.so' from > LD_PRELOAD cannot be preloaded: ignored. > ERROR: ld.so: object '/disk01/apps/dmtcp/lib/dmtcp/libdmtcp_ipc.so' from > LD_PRELOAD cannot be preloaded: ignored. > ERROR: ld.so: object '/disk01/apps/dmtcp/lib/dmtcp/libdmtcp_timer.so' from > LD_PRELOAD cannot be preloaded: ignored. > ERROR: ld.so: object '/disk01/apps/dmtcp/lib/dmtcp/libdmtcp.so' from > LD_PRELOAD cannot be preloaded: ignored. > ERROR: ld.so: object '/disk01/apps/dmtcp/lib/dmtcp/libdmtcp_pid.so' from > LD_PRELOAD cannot be preloaded: ignored. > > The problem preloading only happens when I try to start the vncserver. I > can use dmtcp just fine with all other applications, including the examples > provided in the test directory. I've tried preloading the libraries above > with the --with-plugin option but this does change anything (apart from > additional messages about not being able to preload). > > When I continue on despite the preload issues I try running the vnc client > which does not work: > [maclach@localhost ~]$ vncviewer :1 > > TigerVNC Viewer for X version 1.1.0 - built Oct 30 2014 12:44:50 > Copyright (C) 1999-2011 TigerVNC Team and many others (see README.txt) > See http://www.tigervnc.org for information on TigerVNC. > > Mon Apr 13 17:06:32 2015 > main: unable connect to socket: Connection refused (111) > > > Without dmtcp there is no problem running tightvnc. Any ideas about where > I'm going wrong or how to work around this problem would be _greatly_ > appreciated. > > Thanks, Glen. > > > > ------------------------------------------------------------------------------ > BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT > Develop your own process in accordance with the BPMN 2 standard > Learn Process modeling best practices with Bonita BPM through live > exercises > http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- > event?utm_ > source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF > _______________________________________________ > Dmtcp-forum mailing list > Dmtcp-forum@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/dmtcp-forum > ------------------------------------------------------------------------------ BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT Develop your own process in accordance with the BPMN 2 standard Learn Process modeling best practices with Bonita BPM through live exercises http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_ source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF _______________________________________________ Dmtcp-forum mailing list Dmtcp-forum@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dmtcp-forum
